The error box area is 3245 sq. arcmin, and its maximum
dimension is 5.05 deg (the minimum one is 11.2 arcmin).
The Sun distance was 62 deg.
This box may be improved.
A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB170320_T13359/IPN
The time history and spectrum will be given in forthcoming GCN Circulars.

GCN Circular #20934
Yi Zhao (IHEP), Yuanhao Wang (IHEP), Zhengheng Li (IHEP)
report on behalf of the POLAR collaboration:
At 2017-03-20T03:42:39.00 UT (T0), during a routine on-ground
search of data, POLAR detected the GRB 170320A,
which was also detected by INTEGRAL/SPIACS (ID 170320.15474)
and the KONUS-Wind.
The POLAR light curve consists of a single peak,
with a duration (T90) of 5.74 s measured from T0+2.79 s.
The 1-s peak rate measured from T0+3.00 s is 2258.1 cnts/s.
The total counts is about 5844 cnts.
LC_URL:
http://polar.ihep.ac.cn/grb/2017/03/GRB170320A/lc/POLAR_lc_grb170320A.png
The above results are not dead time corrected. The above
measurements are in the energy range of about 80-500 keV.
All analysis results presented above are preliminary.
POLAR is a dedicated Gamma-Ray Burst polarimeter (50-500 keV)
on-board the Chinese space laboratory Tiangong-2 launched on
Sep 15,2016. More information about POLAR can be found at
http://polar.ihep.ac.cn/en/ , http://isdc.unige.ch/polar/
and http://polar.psi.ch/pub/.

GCN Circular #20935
A. Tsvetkova, S. Golenetskii, R.Aptekar, D. Frederiks, P. Oleynik,
M. Ulanov, D. Svinkin, A. Lysenko, A. Kozlova and T. Cline
on behalf of the Konus-Wind team, report:
The long-duration, intense GRB 170320A
(IPN Triangulation: Hurley et al., GCN 20927;
POLAR Observation: Zhao et al., GCN 20934)
triggered Konus-Wind at T0=13359.957 s UT (03:42:39.957).
The burst light curve shows a multipeaked structure with a total
duration of ~30 s.
The emission is seen up to ~5 MeV.
As observed by Konus-Wind, the burst
had a fluence of 1.87(-0.30,+0.34)x10^-5 erg/cm2,
and a 64-ms peak energy flux, measured from T0+0.592 s,
of 1.01(-0.19,+0.20)x10^-5 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum of the burst
(measured from T0 to T0+35.072 s)
is best fit in the 20 keV - 15 MeV range
by the GRB (Band) model with the following parameters:
the low-energy photon index alpha = -1.35(-0.15,+0.21),
the high energy photon index beta = -2.41(-0.46,+0.22),
the peak energy Ep = 111(-22,+23) keV,
chi2 = 99/97 dof.
The spectrum near the peak count rate
(measured from T0 to T0+2.304 s)
is best fit in the 20 keV - 15 MeV range
by the GRB (Band) model with the following parameters:
the low-energy photon index alpha = -0.52(-0.17,+0.20),
the high energy photon index beta = -2.21(-0.18,+0.13),
the peak energy Ep = 178(-24,+29) keV,
chi2 = 79/69 dof.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB170320_T13359/
All the quoted errors are at the 90% confidence level.
All the quoted values are preliminary.